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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0eacddb24b096949e4eadce2233b8c9c8804cc64f3dfe297d951aaa0dbcb70' 
  AND token = 'prnPrlAVuc81dOPjKqVbQNrYNwk6yT3j5aPXsW6al8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}